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Magnesia Dolomite Brick

Magnesia Dolomite Brick

Magnesia Dolomite Brick are available in burned and carbon-bonded compositions. The carbon-bonded varieties include both pitch and resin-bonded versions.
Some of the carbon-bonded products contain flake graphite and are somewhat analogous to magnesite-carbon brick. Magnesia Dolomite Brick are widely applied in applications as diverse as argon-oxygen decarburization vessels (AOD’s), rotary cement kilns and steel ladles.

Magnesia Dolomite Brick

Magnesia Dolomite Brick is an alkaline refractory with many advantages. Like high refractoriness, strong resistance to alkaline slag, stable thermodynamic properties, high temperature and vacuum stability, and so on. Therefore, it is considered as the preferred substitute for Magnesia Chrome Brick. In addition, Magnesite Dolomite Brick also have the characteristics of non-polluting molten steel, purifying molten steel, and catching non-metallic impurities such as Al2O3, S, P in molten steel that other refractory materials cannot match.

Magnesia Dolomite sand can be divided into three types according to CaO/MgO: (CaO/MgO>1.39), (CaO/MgO=1.39) and (CaO/MgO<1.39).

Magnesia Dolomite sand is the raw material of high-quality alkaline refractory with oxides MgO and CaO as the main chemical components, so Magnesite Dolomite refractory has strong corrosion resistance to alkaline slag.

 The influence of three main impurities in Magnesia Dolomite bricks on the high temperature properties of CaO varies greatly.

Among them, SiO2 reacts with CaO to generate C3S or C2S, with melting points of 1900°C and 2130°C respectively. Both of them belong to minerals with high melting points, and have little impact on the high-temperature properties of CaO.

However, Fe2O3 and Al2O3 react with CaO to form minerals such as C2F and C4AF with low melting points of 1436°C and 1415°C, respectively. The formation of these two low melting point minerals has a great negative impact on the high temperature properties of CaO.

 Magnesia Dolomite brick are widely applied in applications as diverse as argon-oxygen decarburization vessels (AOD’s), VOD furnace and LF furnace.

OSYMEN

MgO

CaO

A.P

B.D

C.C.S

R.U.L

%

%

%

g/cm3

MPa

(Ta)°C

MD-20A

75.0

18-22

8.0

3.00

55

1700

MD-20B

75.0

18-22

8.0

2.95

50

1700

MD-30A

65.0

28-32

8.0

3.00

55

1700

MD-30B

65.0

28-32

8.0

2.95

50

1700

MD-40A

55.0

38-42

8.0

3.00

55

1700

MD-40B

55.0

38-42

8.0

2.95

50

1700

AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load

Last updated: 2024-01-03
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